JSON for Modern C++

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• Updated Nov 12, 2026
• C++

FlatBuffers: Memory Efficient Serialization Library

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• Updated Nov 8, 2026
• C++

FASTJSON 2.0.x has been released, faster and more secure, recommend you upgrade.

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• Updated Jul 29, 2026
• Java

Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks

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• Updated Nov 11, 2026
• C++

The better way to deal with JSON data in Swift.

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• Updated Aug 18, 2026
• Swift

Get JSON values quickly - JSON parser for Go

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• Updated Nov 8, 2026
• Go

A high-performance 100% compatible drop-in replacement of "encoding/json"

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• Updated May 27, 2024
• Go

THE fastest alternative JSON parser for Go that does not require schema

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• Updated Oct 5, 2026
• Go

Fast JSON serializer for golang.

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• Updated Mar 14, 2026
• Go

🚄 FASTJSON2 is a Java JSON library with excellent performance.

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• Updated Oct 30, 2026
• Java

Jodd! Lightweight. Java. Zero dependencies. Use what you like.

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• Updated Apr 15, 2024
• Java

Optimized JSON

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• Updated Nov 11, 2026
• C

Fast JSON parser and validator for Go. No custom structs, no code generation, no reflection

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• Updated Feb 21, 2026
• Go

An incredibly fast, pure Elixir JSON library

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• Updated Aug 12, 2024
• Elixir

simplejson is a simple, fast, extensible JSON encoder/decoder for Python

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• Updated Nov 11, 2026
• Python

jsoniter (json-iterator) is fast and flexible JSON parser available in Java and Go

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• Updated Feb 19, 2024
• Java

Lightweight JSON library written in C.

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• Updated Sep 15, 2026
• C

Converter utility between XML text and Javascript object / JSON text.

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• Updated Jul 26, 2024
• JavaScript

Efficient, easy-to-use, and fast PHP JSON stream parser

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• Updated Oct 25, 2026
• PHP

A micro-library of stream components for building custom JSON and JSONC processing pipelines with a minimal memory footprint — parse, filter, and transform JSON far larger than available memory with a SAX-inspired token API, on Node.js or Web Streams.

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• Updated Nov 9, 2026
• JavaScript